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G. H. KUHL AUTOMATIC TELEPHONE SYSTEM Original Filed May 8, 1919 [UL/E nZUr wyd AQ/LZ W Hm Patented May 13, 1924.

UNITED STATES PATENT OFFICE.

GEORGE H. KUHL, OF CHICAGO, ILLINOIS, ASSIGNOR TO AUTOMATIC ELECTRIC COM- PANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

AUTOMATIC TELEPHONE SYSTEM.

Application -filed May 8, 1919, Serial No. 295,535. Renewed October 6, 1923.

To all whom it may concern.

Be it known that I, G-noaon H. KUHL, a citizen of the United States of America, and a resident of Chicago, in the county of Cook and Stateof Illinois, have invented certain new and useful Improvements in Automatic Telephone Systems, of which the following is a specification.

My invention relates in general to an au tomatic telephone system and more specifically to an improved non-numerical line switch of the rotary type for use in such a system.

Among the objects of my invention are to provide a line switch which is driven by gears in's'uch a. manner as to render its op- W eration comparatively silent and also to reduce the wearjand tear due to the operation of a ratchet and pawl such as is usually used in the rotarytype of line switch. By the use of a motor such as I have shown, and which is disclosed and claimed in a prior application ofJohn Erickson, Serial No. 259,062, filed October 21, 1918, I have provided such a gear driven line switch which is efficient and s eedyin its operation as well' assilent and which has a longer life than the usual typ'e, of line' switch.

Further objects are to provide certain novel and improved circuit details and arrangements which tend to provide a practical and useful line switch 0t its type.

urthendetails and improvements will be pointed out hereinafter.

I will now describe the operation of the line switch more in detail, reference being had to the accompanying drawings in which: i I

Fig. 1 shows a calling line A of the automatictype provided with the usual talking equipment and a calling device, a line switch C whichembodies the feature of my invention, and a selector switch D of the well known Strowger type which is accessible to the line switch C. The selector D may have access in the usual manner to additional similar selectors and connector switches for completing connections, or to connector switches direct without departing in any way from the spirit of my invention, as it will be seen that such a line switch C may be used with any type of line or switches either in :1 full automatic system or in a semi-autonnu' ic system as a traffic distributor.

Fig. 3 shows the mechanism of the motor magnet of the line switch C with its devices for rotating the wiper shaft to advance the wipers oi' the switch.

Fig. 3 shows an alternative means for controlling the motor magnet of the line switch C.

Figure 1 shows a sectional view of the motor magnet along the line A in Figure 2.

When the receiver at substation A is removed to initiate a calla circuit is completed for the line relay 2 of the line switch C in series with the line A and to the ground G.

Relay 2 energizes to close a series circuit from ground through springs 3, relay 4, and magnet 5 of the motor magnet to battery. At the same time a circuit is closed from private wiper 7, through springs Sand 9, springs 10, and through ma net 5,to battery. Now it will be seen that should the trunk upon whose contacts the wipers of the switch C are standing be busy at this time there will be a ground resent onthe test contact 11 of that trun which will completc a short circuit of the relay 4 and complete the last traced direct circuit for the, ma 'net 5. The motor of the line switchC as shown in Fig. 2 is of a type shown in said application of John Erickson having a rotary armature which alternately influenced by a pair of magnets thereby causing the armature to rotate in always the same direction, a worm gear is attached to an extension of the armature and is associated with a gear wheel which is firmly fixed'to the wiper shaft to drive the same in one, direction continuously over the contacts in the, bank. The wipers are of the double ended; type, one end of the wipersbeing always in engagement with a set of the contacts in the bank. The energization of the magnet .5 over the above traced circuit causes the armature of the magnet to be moved one half turn and therefore to step the wipers of the switch off the contacts on which they are standing and to a mid-point between sets of contacts. The wiper 13 is off set on the shaft so that it is always one half step behind the other wipers 12, 7 and 14:, so that it is out of engagement with the contacts of the line of substation A through to the wipcircuit with magnet 5.

. relay the wipers 12, 7 and 14 move one half step out of engagement with the contacts of the busy trunk line and the wiper 12-3 moves into engagement with a contact such as 1: which is permanently grounded. A. circuit is at this time completed for the other operating magnet (3 of the motor magnet to cause the armature to complete its full rotation. This latter half step of the armature m'oves the wipers 12, 7 and it into engagement with the contacts of the next trunk line and moves the wiper 13 out of contact with contact 1s.

This alternate operation of magnets and U will again be accomplished in the same manner if the next trunk line is busy. However, if the next line is idle then there will be no onnd present on contact ll, to which it will be assumed the wipers have advanced. In this case there will be no short circuit completed about the relay 4 and relay 4 will therefore energize in the before traced ser es Relay 4 being of comparatively high resistance does not perwit the energization of the magnet 5. Re lay 4, upon energizing, removes the ground and relay 2 from the line circuit and extends em 12 and 14 which are assumed to be in connection'with the selector D. A circuit is completed in the usual manner for the line 16 of the selector D which closes the circuit of slow relay 17 which in turn operates to prepare a. circuit for vertical magnet 18 and slow relay 19 and also to supply holding ground to the release trunk to maintain the relay 4 of line switch C energized.

Relay 16 is then controlled by the calling de vibe to operate the vertical ma 'net 18 to step the wipers to a level of the billili, after which relays 19 and 20 co-operate in the usual mann er to control the rotary magnet 21 to 'step 'the wipers automatically to an idle trunk line. Relay 22 energizes as soon as such idle trunk line is reached to switch the connection through to the wipers of the switch D and thence to the selected trunk linewhich may, as stated, lead either to other automatic switches or to an operators trunk circuit.

The release of the apparatus shown is controlled in the usual manner by the restoration of the receiver at the calling phone which causes the removal of ground from the release trunk and the consequent dcenergization of the relay 4 of the line switch C. This deenergization of relay 4 restores the line switch C to normal condition in readiness for a succeeding call. It will be seen therefore that this line switch is driven always in one. direction by the operation of a motor magnet which consists of two magnets, one controlled directly over the private wiper and the other controlled over a special wiper two impulses to the magnet causing one step of the wipers.

In the modification which I have shown in Fig. 3 I have shown simply a different means for controlling the magnet of the switch C which will render unnecessary the use of an extra wiper 13 and its set of contacls in the hank. In this modification I have shown only a portion of the switch C as it will he understood that the only change necessary will be the circuit of the motor magnet and that the relays 2 and 4 will function the same as before. Referring to Fig. 3 when the relay 2 energizes the circuit will lead from the private wiper through springs 10', springs 30 and 31, and magnet 5' to battery. trolled by the motormagnet will be changed in. ratio so that. one half turn of the armature of the motor ma net will move the wipers one whole step om one set of contacts to the next, so that when the above cirsuit of magnet 5' is closed said m et 0 crates to step the wipers of the swi to the next set of contacts and also 0 rates to open the springs 30 and 31 and cfi se springs 30 and 32. The closure of springs 30and 32 will not occur until the wipers are in engagement with the next trunk line and if. this next trunk line is busy then the. opera In this instance the gears contion of magnet 6 causes another full step of meanwhile falls back and agam prepares a circuit for itself. This operation of the two magnets alternately from successive trunk lines continues until an idle trunk is reached at which time relay 4' energizes to open the. circuit of the motor magnetfrom the private wiper and to open-.the s rings 33 and 34 and close the springs 34 an 35. This operation has no efl'ect at this time as relay 2' maintains the springs 36 open for an interval after its circuit is opened. In releasing, however, after a 'call is finished when the relay 4 deenergizes, a circuit is momentarily completed for the magnet 6' from ground through springs 33, 34 and 35, springs 36, and said magnet to battery. This is simply to insure that the armature stands in readiness to be moved in the next succeeding call as magnet 5 is energized. It being understood that if magnet 5' were energized last in the preceding call, then deenergized without operating 6, then in the next call the magnet 5' being energized to step the wipers would have no efi'ect on the rotary armato re.

It will be seen therefore, that I have provided a very simple and speedy line switch of the gear driven type for.. accomplishing the objects pointed out and which has a novel method of control.

I-Iavi'ng fully described and ascertained the features and aspects of my invention, what I consider to be new and desire to have I protected by Letters Patent will be pointed out in the appended claims.

What I claim as my invention is:

1. In a telephone system, a line, a non+ numerical switch for said line, wipers for said switch, a pair of magnets each operating to move the wipers, means for energizing one of said magnets over one of said wipers to move said wipers to complete a circuit for the other magnet to extend a connection from said line, each magnet having a circuit including one of said wipers.

2. In a telephone system, a line, a nonnumerical switch individual to said. line, wipers for said switch, a pair of magnets, a circuit for each magnet including a wiper of the switch and means for closing said circuits alternately to move said wipers to extend a connection from said line.

3. In a telephone system, an automatic switch, a motor for driving said switch, a pair of wipers for the switch, said motor consisting of a pair of magnets having a common armature, and a circuit for each magnet including one of said wipers.

4. In a telephone system, an automatic switch, a motor for driving said switch, a pair of wipers for the switch, said motor consisting of a pair of magnets, and a circuit for each magnet including a wiper, and means for causing said magnets to be alternately energized over said wipers to move the wipers.

5. In a telephone system, a non-numerical automatic switch havingmovement in only one plane, a motor for driving said switch consisting of a pair of magnets, a circuit for each magnet, and means controlled by each magnet for automatically closing the circuit of the'other magnet to operate said switch in a step by step manner to select an idle trunk.

6. In a telephone system, an automatic switch, a motor for driving the switch consisting of a pair of magnets, wipers for said switch, a circuit for each magnet including a wiper of the switch, said circuits closed alternately by said wipers to cause the motor to operate the automatic switch.

7. In a telephone system, an automatic switch, trunklines accessible to said switch, a motor for drivin said switch, a test contact for each trunkline, a normally grounded contact for each trunk line, wipers for the switch, certain of said wipers co-operating with said contacts, said motor controlled over said test contact and a wiper of the switch to move the wipers out of engagement with the trunk line associated therewith, and controlled over said grounded contact and a wiper of the switch to step wipers for the switch, trunk lines accessible 2 thereto, two successive operations of the motor being required to move the wipers of the switch one step from one trunk line to another, and means for giving the motor one of the successive operations required over a circuit including one wiper of the switch and another operation over a circuit including another wiper.

9. In a telephone system, a non-numerical line switch, a motor individual to said switch for driving said switch, said motor having a gear for directly operating the wipers of the switch in a step by step manner.

10. In a telephone system, a non-numerical line switch, wipers for said switch, a shaft carrying said Wipers, a gear on said shaft,and a motor individual to said switch having a worm gear co-operating with the gear on the wiper shaft to drive the wipers in a step by step manner.

11. In a telephone system, a non-numerical line switch, wipers for said switch, a-shaft carrying said wipers, a gear on said shaft, and a motor individual to said switch having a worm gear co-operating with the gear on the wiper shaft to drive the wipers always in one direction in a step by step manner.

12. In a telephone system, a non-numerical line switch, wipers for said switch, a shaft carrying said'wipers, a gear on said shaft, and a motor individual to said switch having a worm gear co-operating with the gear on the wipershaft to drive the wipers in a step-by-step manner.

13. In a telephone system, a subscribers line, an automatic switch individual to said line responsive to the closure of said line to automatically select an idle trunk line, wipers for the switch, a motor individual to said switchyand co operating gears driven by said motor to operate the switch to perform its selec'ting operation by advancing saidwipers. a

-'14.'In='a telephone system, a subscribers line, an automatic switch individual to said line responsive to the closure of said line to automatically select an idle trunk line, a motor for said switch, and co-operating gears driven by said motor to operate the switch to perform its selecting operation, said motor consisting of a pair of magnets operated alternately over the wipers of the switch.

[5. In a telephone system, a subscribers line, an automatic switch individual to said line responsive to the initial closure of said line to automatically select an idle trunk line, a motor for said switch, a. rivate wiper for said switch, said motor individual by the armature for automatically controlling said armature to select an idle trunk.

17. In a telephone system, an automatic switch, wipers for the switch, contacts accessible to the wipers, a motor for driving the wipers, a pair of field coils for the motor, anarmature for the motor, said wipers acting as brushes over a commutator consisting of the contacts and directly in the circuit of the field coils to move the armature of the motor.

18. In a telephone system, an automatic switch, wipers for the switch, contacts aceessible to the wipers, a motor for driving the wipers, a pair of field coils for the motor, an armature for the motor, said wipers acting as brushes over a commutator consisting of the contactstc alternately control the field coils to move the armature ot' the motor, said wipers directly in the circuit 1 of said field coils.

19. In a telephone system, a step-by-step automatic switch having wipers and contacts, a pair of magnets having a common armature for rotating said wipers, said magnets each controlled over .a separate wiper of the switch to step said wipers over their contacts.

20. In a telephone systemyan automatic switch, contacts accessible thereto, wipers cooperating with said contacts, a motor for driving said wipers having a pair of magnet-s each connected to one ofsaid wipers, means for maintaining one oi said wipers normally in engagement with the test contact of'a trunk line, one magnet operated over said test contact to move said"wiper out'of engagement with saidtest contact and to complete a circuit forthe other imag net including the other wiper and one of its contacts, said other magnet energized over this completed circuittfo step the wipers into engagement with a contact of the next trunk line. 1 I I r i 21. Ina telephone system, an automatic switch, trunk linesaccessible thereto having Means test contacts, wipers for the switch cooperating with said test contacts, a motor for driving said wipers having a pair of magnets controlling a common armature, each magnet having a circuit including a separate wiper of the switch, and means for completing the circuit of said magnets alternately over said wipers to step said wipers from thd contacts of one-trunk line to the next. A

22. In a'telephone system, a non-numerical switch, a wiper set for said switch including a test wiper, bank contact sets adapted to be engaged by said wiper set, two motor magnets for stepping said wiper set, a circuit including said test wiper for energizingi orieof said mbtoif magnets to step said wiper set, a circuit for energizing the other of said motor magnets to step said wiper set, and means for closing said circuits alternately.

23. In a telephone system, a non numerical switch, a wiper set for saidswitch including a test wiper, sets of bank contacts adapted tobe engaged by said wiper set, two motor magnets for stepping said wiper set, and means for energizing said motor magnets alternately over said test wiper to advance said Wiper set over said bank contact sets.

24.. In a telephone'system, a non-numerical switch, a wiper-set for said switch including a test wi 1', bank contact sets: adapted to be engage lcy said wiper set, two motor magnets for stepping said, wiper set, a cir cuit for energizing one of said motor magnets including said test wiper and-a bank contact in one of said contactsets to step said wiper set, ands circuit including said test wiper and a bank contact in another of said sets for energizing theo'ther of said motor'magnets toagaintstepsaid wiper set. i 25.: In aitelepho ne system,:anon-numericat switch, a wiper set for said switch including a test'wiper, bank contact sets adapted to be engaged by said wiper set, two motor magnetsiorsaid switch, a circuit tor one of said motor magnets including said test wiper, a circuit for the other of said motor magnets including? mid, test wiper and controlled by the first magneaaandimeans lor energizing said magnets alternately to advance said wipers. a 1 Signed by me at Chico/ 0,, Cook County, Illinois, this 5th dayofa ,1919. i

1 I H; KUHL. 

